Toxic and essential metal concentration of freshwater fishes from Pyasachnik Dam, Bulgaria

K. Peycheva*, V. Panayotova, L. Makedonski, M. Stancheva

Department of Chemsitry, Faculty of Pharmacy, Medical University of Varna, 55 Marin Drinov, 9000 Varna, Bulgaria

Abstract. The aim of the present study is to evaluate the concentration of some toxic (As, Hg, Pb, Cd and Ni) and essential elements (Zn, Cu, Fe, Cr and Mn) inedible part of three fresh water fish species collected from Pyasachnik Dam during 2010. The species analyzed were silver carp (Hypophthalmichthys molitrix), grass carp (Ctenopharyngodon idella) and European carp (Cyprinus Carpio). The results were expressed as mg/kg wet weight. Common crap species were differentiated from the other three species by high concentration of Zn (11 mg/kg wet weight), Fe (7 mg/kg wet weight) and As (0.58 mg/kg wet weight) in muscle tissues. Concentrations of the analyzed elements were within the limits set from various health organization (FAO/WHO, EU and Bulgarian Food Codes) and are at acceptable levels for human consumption. Additionally the results obtained in this study were compared with those reported in other studies and they clearly demonstrated that the analyzed fish samples from Pyasachnik dam do not faced metal pollution in particular areas for toxic (As, Hg, Pb, Cd and Ni) and essential elements (Zn, Cu, Fe, Cr and Mn).